Lives on mud or sandy mud where it filters phytoplankton?
- Surface is sculptured with 30 or more radiating ribs
- The shell is symmetrical around the beak.
Thin shell up to 1.5cm in length. The shell is translucent but this is obscured by the dirty white or cream periostracum. The surface of the shell is sculptured with radiating ribs and concentric lines. When alive the animal displays obvious pink tentacles.